Chemicals in the body called neurotransmitters help control the way the brain functions. CNS depressants increase the activity of gamma-aminobutyric acid (GABA).

Don't forget to check out Allie's report on the brain.

The effect of this increase is that brain activity is slowed down, causing a calming feeling, or drowsiness, or even sleep.

Dosage size is an important factor with depressant usage. Too large a dose can seriously disrupt breathing and circulation, “slowing them down” to dangerous levels. That’s just one of the reasons why CNS depressants should never be used unless prescribed for you by a doctor or other healthcare professional.

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